2QHN:
reference: Optimization of a pyrazoloquinolinone class of Chk1 kinase inhibitors., Brnardic EJ, Garbaccio RM, Fraley ME, Tasber ES, Steen JT, Arrington KL, Dudkin VY, Hartman GD, Stirdivant SM, Drakas BA, Rickert K, Walsh ES, Hamilton K, Buser CA, Hardwick J, Tao W, Beck SC, Mao X, Lobell RB, Sepp-Lorenzino L, Yan Y, Ikuta M, Munshi SK, Kuo LC, Kreatsoulas C, Bioorg Med Chem Lett. 2007 Nov 1;17(21):5989-94. Epub 2007 Aug 19. PMID: 17804227

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).